The transition of the preovulatory follicle into the corpus luteum is very critical event that involves structural and functional changes in nonvascular granulosa and highly vascular theca layers of the preovulatory follicle.

Within the "other" group, 142 women (17%) were anovulatory, 71 (9%) had questionable luteal phase, 15 (2%) were oligo-ovulatory, 8 (1%) had a persistent corpus luteum and 5 (1%) had inconsistent information so could not be classified.

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